0-250kmh for the 335i is in about 35 seconds. My N54 did that in 32/33 seconds as I recall.
There is some flat road(highway) around here where we can do that stuff (more than)sometimes.

My ex E90 M3 did that in >25/26 seconds or so, don't remember.

The N20 needs 17 seconds more than the N55 to do that, looking at that video.

Those are good numbers but I'll ask you this...Was your N54 stock and have you ever been in a tuned and modified N54 with Methanol Injection doing 0-250? It's probably another 4-5 seconds quicker than that M3 and the modifications to do so only cost about $2,000 USD...